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Synaptic Remodeling and Neosynaptogenesis

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Handbook of the Cerebellum and Cerebellar Disorders

Abstract

Correct neural circuit function requires the development of highly specific inter-neuronal connectivity. This chapter describes axon-target interactions in the rodent olivocerebellar path, looking at the changes in synaptic contacts between climbing fibers and Purkinje cells, during developmental synapse formation, selective synapse stabilization, and synaptic reformation. Examining the interactions between climbing fibers and Purkinje cells during normal development and in abnormal circumstances, such as during post-lesion reinnervation, evaluates the relative importance of each synaptic partner in determining the specificity of connections within a network. We briefly describe the formation and refinement of normal developmental climbing fiber-Purkinje cell synapse. Then we examine the relative roles of the maturation and prior synaptic experience of both climbing fibers and Purkinje cells during the reformation of their contacts later in maturation. In this chapter, we show that climbing fibers largely retain their capacity to reproduce the processes of developmental synaptogenesis, whereas Purkinje cells are permanently altered by the process of climbing fiber innervation and synapse selection, so that they cannot reproduce normal developmental events later in maturation. Although these studies increase the understanding of network development and stability, they also provide important information about neosynaptogenesis, which is necessary for neural circuit reorganization after a lesion, and about how it can be maximized for optimal repair.

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Correspondence to Ann M. Lohof .

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Lohof, A.M., Letellier, M., Mariani, J., Sherrard, R.M. (2022). Synaptic Remodeling and Neosynaptogenesis. In: Manto, M.U., Gruol, D.L., Schmahmann, J.D., Koibuchi, N., Sillitoe, R.V. (eds) Handbook of the Cerebellum and Cerebellar Disorders. Springer, Cham. https://doi.org/10.1007/978-3-030-23810-0_13

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